128418031684465 has 4 divisors (see below), whose sum is σ = 154101638021364. Its totient is φ = 102734425347568.

The previous prime is 128418031684427. The next prime is 128418031684471. The reversal of 128418031684465 is 564486130814821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25298556074289 + 103119475610176 = 5029767^2 + 10154776^2 .

It is a cyclic number.

It is not a de Polignac number, because 128418031684465 - 2⁷ = 128418031684337 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12841803168442 + ... + 12841803168451.

It is an arithmetic number, because the mean of its divisors is an integer number (38525409505341).

Almost surely, 2^{128418031684465} is an apocalyptic number.

It is an amenable number.

128418031684465 is a deficient number, since it is larger than the sum of its proper divisors (25683606336899).

128418031684465 is an equidigital number, since it uses as much as digits as its factorization.

128418031684465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25683606336898.

The product of its (nonzero) digits is 35389440, while the sum is 61.

The spelling of 128418031684465 in words is "one hundred twenty-eight trillion, four hundred eighteen billion, thirty-one million, six hundred eighty-four thousand, four hundred sixty-five".